[tomcat] How to change the port of Tomcat from 8080 to 80?

On Ubuntu and Debian systems, there are several steps needed:

  1. In server.xml, change the line <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/> to have port="80".

  2. Install the recommended (not required) authbind package, with a command like:

    sudo apt-get install authbind

  3. Enable authbind in the server.xml file (in either /etc/tomcat6 or /etc/tomcat7) by uncommenting and setting the line like:

    AUTHBIND=yes

All three steps are needed.

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